Class: FortIO::Namelist::Scanner

Inherits:
Object
  • Object
show all
Defined in:
lib/fortio-namelist/fortran_namelist.tab.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(text) ⇒ Scanner

Returns a new instance of Scanner.



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# File 'lib/fortio-namelist/fortran_namelist.tab.rb', line 20

def initialize (text)
  @s = StringScanner.new(text)
  @in_namelist = nil
end

Instance Attribute Details

#in_namelist ⇒ Object

Returns the value of attribute in_namelist.



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# File 'lib/fortio-namelist/fortran_namelist.tab.rb', line 25

def in_namelist
  @in_namelist
end

Instance Method Details

#debug_info ⇒ Object 



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# File 'lib/fortio-namelist/fortran_namelist.tab.rb', line 27

def debug_info
  lines  = @s.string.split(/\n/)
  lineno = @s.string[0...@s.pos].split(/\n/).size
  info = ""
  if lineno > 1
    info << format("   %4i: %s\n", lineno-1, lines[lineno-2])
  end
  info << format(">> %4i: %s\n", lineno, lines[lineno-1])
  if lineno <= lines.size - 1
    info << format("   %4i: %s\n", lineno+1, lines[lineno])
  end
  info
end

#yylex ⇒ Object 



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# File 'lib/fortio-namelist/fortran_namelist.tab.rb', line 41

def yylex
  while @s.rest?
    unless @in_namelist
      case
      when @s.scan(/\A([\$&])/)              ### {$|&}
        @in_namelist = "dummy"
        return [
          @s[0], 
          nil
        ]
      when @s.scan(/\A[^\$&]/)
        next
      end       
    else
      case
      when @s.scan(/\A\(/)
        return [
          '(',
          nil
        ]
      when @s.scan(/\A\)/)
        return [
          ')',
          nil
        ]
      when @s.scan(/\A\:/)
        return [
          ':',
          nil
        ]
      when @s.scan(/\A[+-]?(\d+)\.(\d+)?([ED][+-]?(\d+))?/i) ### float
        return [                              ### 1.2E+3, 1.E+3, 1.2E3
          :FLOAT,                             ### 1.2, 1.
          @s[0].sub(/D/i,'e').sub(/\.e/,".0e").to_f
        ]
      when @s.scan(/\A[+-]?\.(\d+)([ED][+-]?(\d+))?/i)       ### float
        return [                              ### .2E+3, -.2E+3, .2E3
          :FLOAT,                             ### .2, -.2
          @s[0].sub(/D/i,'e').sub(/\./, '0.').to_f
        ]
      when @s.scan(/\A[+-]?(\d+)[ED][+-]?(\d+)/i)            ### float
        return [                              ### 12E+3, 12E3, 0E0
          :FLOAT, 
          @s[0].sub(/D/i,'e').to_f
        ]
      when @s.scan(/\A\d+[a-z_]\w*/i)         ### STRING-Like
        return [
          :STRINGLIKE,
          @s[0]
        ]
      when @s.scan(/\A[\-\+]?\d+/)            ### digits
        return [
          :DIGITS, 
          Integer(@s[0])
        ]
      when @s.scan(/\A'((?:''|[^'])*)'/)      ### 'quoted string'
        return [
          :STRING, 
          @s[1].gsub(/''/, "'")
        ]
      when @s.scan(/\A"((?:""|[^"])*)"/)      ### 'double-quoted string'
        return [
          :STRING, 
          @s[1].gsub(/""/, '"')
        ]
      when @s.scan(/\A,/)                     ### ,
        @s.scan(/\A[ \t]+/)
        while @s.scan(/\A\n[ \t]*/) or @s.scan(/\A\![^\n]*/)
          ### skip comment
        end
        if @s.scan(/\A\&[ \t]*\n[ \t]*\&/)  ### & &
          return [
            ',',
            nil
          ]
        elsif @s.match?(/\A[a-z]\w*\s*,/i) 
          return [
            ',', 
            nil
          ]
        elsif @s.match?(/\A[a-z]\w*/i) or @s.match?(/\A[\&\$\/\!]/)
          return [
            :COMMA, 
            nil
          ]
        elsif @s.match?(/\A,/)
          return [
            :NIL,
            nil
          ]
        else
          return [
            ',',
            nil
          ]
        end
      when @s.scan(/\A\&[ \t]*\n[ \t]*\&/)      ### & &
        next            
      when @s.scan(/\A[\$&\/=\(\):*]/)        ### {$|&|/|,|=|(|)|:|*}
        return [
          @s[0], 
          nil
        ]
      when @s.scan(/\A_\w*/i)                 ### STRING-Like
        return [
          :STRINGLIKE,
          @s[0]
        ]
      when @s.scan(/\A\.t[\w\d_]*\.?/i)             ### LOGICAL true
        return [                 
          :LOGICAL,
          true,
        ]
      when @s.scan(/\A\.f[\w\d_]*\.?/i)             ### LOGICAL false
        return [
          :LOGICAL,
          false,
        ]
      when @s.match?(/\At[^\w]/i)             ### LOGICAL true
        @s.scan(/\At/i)
        ms = @s[0]
        if @s.match?(/\A[ \t]*=/)
          return [
            :IDENT,
            ms
          ]
        else
          return [                 
            :LOGICAL,
            true,
          ]
        end
      when @s.match?(/\Af[^\w]/i)             ### LOGICAL false
        @s.scan(/\Af/i)
        ms = @s[0]
        if @s.match?(/\A[ \t]*=/)
          return [
            :IDENT,
            ms
          ]
        else
          return [                 
            :LOGICAL,
            false,
          ]
        end
      when @s.scan(/\A[a-z]\w*/i)             ### IDENT or LOGICAL
        return [
          :IDENT,
          @s[0]
        ]
      when @s.scan(/\A\n/)                    ### newline
        return [
          :NL,
          nil
        ]
        next
      when @s.scan(/\A[ \t]+/)                ### blank
        next
      when @s.scan(/\A![^\n]*?\n/)            ### comment
        next
      else
        @s.rest =~ /\A(.*)$/
        raise "namelist parse error ('#{$1}')\n" + debug_info
      end
    end
  end
end